Structured Query Language (sql)
Bayani Gaba-gaba
A database with a million records is useless unless you can ask it a question and get the four rows you actually wanted. The language for asking is SQL, and its central idea is unusual for a programming language: you describe what you want rather than how to find it. You do not write a loop over a million records. You say which fields, from which tables, matching which condition, and the database works out the rest.
This lesson covers the commands the specification names. You will learn to retrieve data with SELECT, FROM and WHERE, including queries that draw on two tables at once; to add a record with INSERT INTO; and to edit and delete data with UPDATE and DELETE FROM. You will also learn the single most consequential detail in the whole topic, which is what happens to an UPDATE or a DELETE that is missing its WHERE clause.
Manufura
- Be able to use SQL to retrieve data from a relational database, using the commands:
- SELECT
- FROM
- WHERE. Be able to use SQL to insert data into a relational database using INSERT INTO. Be able to use the SQL commands UPDATE and DELETE FROM to edit and delete data in a database.
Taswirar tunani
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Takardar Darasi
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Nazarin Darasi
Barka da kammala darasi akan Structured Query Language (sql). Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- Which SQL clause states which records a query should return? A. SELECT B. FROM C. WHERE D. INSERT INTO Answer: C
- Which query correctly finds the names of all cats and all birds in a table called Pet? A. SELECT Name FROM Pet WHERE TypeOfAnimal = 'Cat' AND TypeOfAnimal = 'Bird' B. SELECT Name FROM Pet WHERE TypeOfAnimal = 'Cat' OR TypeOfAnimal = 'Bird' C. SELECT Name FROM Pet WHERE TypeOfAnimal = Cat OR Bird D. SELECT Name FROM Pet WHERE TypeOfAnimal = 'Cat' OR 'Bird' Answer: B
- What does the statement DELETE FROM Booking do if it has no WHERE clause? A. Nothing, because a WHERE clause is required B. It deletes the first record only C. It deletes every record in the Booking table D. It deletes the Booking table's field names Answer: C
- Which command is used to change the value already stored in a field? A. SELECT B. INSERT INTO C. UPDATE D. DELETE FROM Answer: C
- In a query drawing on two tables, what is the purpose of a condition such as Pet.PetID = Appointment.PetID? A. It sorts the results into order B. It matches each record in one table with the correct record in the other C. It deletes records that appear in both tables D. It renames a field Answer: B
Yi aikin wadannan tambayoyi a cikin manhaja
Yi aikin wadannan tambayoyi a cikin manhaja
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Yi Aikin Tambayoyin Gwaji
Kana son yin aikin tambayoyin gwaji kan Structured Query Language (sql)? Sauke manhajar Green Bridge CBT don samun tambayoyin gwaji da cikakkun jarrabawa akan wannan batu.
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